displaying a URL on a surface
This is not possible in a direct and interactive way. 

Firstly, Blender can connect to a URL and retrieve the raw html in text form. However, Blender cannot render this html into a visual format and then use it as an image texture. There may be online web services that render an html document into an image (like a screenshot), but Blender would then have to download that image before importing and applying it as a texture.

Secondly, images or videos that are sourced through a URL cannot be directly set as the texture source for a material. The files would have to be downloaded via python and then loaded via a local filepath value. This is possible but would require some steps with scripting, and would not be immediately interactive. 

The same goes for a video file or a sequence of images. They would all have to be downloaded from the remote URL location before being able to be loaded into blender as textures.